CN104942252A - Method for improving internal quality of heavy-rail steel blooms - Google Patents
Method for improving internal quality of heavy-rail steel blooms Download PDFInfo
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Abstract
The invention discloses a method for improving the internal quality of heavy-rail steel blooms. According to the method, the heavy-rail steel blooms are produced through continuous casting, wherein the cross-sectional dimension of each heavy-rail steel bloom is 320 mm*410 mm, the casting speed of a casting machine is 0.70-0.80 m/min and kept unchanged, the total soft reduction at the final stage of solidification is 22 mm, the parameters of electromagnetic stirring and commissioning in a secondary cooling zone are 400 A and 7 Hz; the amount of cooling water in a crystallizer is 3600 L/min; the superheat degree of tundish molten steel is 25-30 DEG C. The method has the advantages that through the reasonable matching of the continuous casting technological parameters of the casting speed, the electromagnetic stirring in the crystallizer, the electromagnetic stirring in the secondary cooling zone, the dynamic soft reduction control at the final stage of solidification and the like, the internal quality problems of the continuous casting blooms during the production of heavy-rail steel blooms with new cross-sections can be solved, and the qualified heavy-rail steel continuous casting blooms can be obtained.
Description
Technical field
The present invention relates to steel-making continuous casting technical field, be specifically related to a kind of method improving Properties of Heavy Rail Steel bloom internal soundness.
Background technology
Soft reduction technique originates in late 1970s, the beginning of the eighties, shrinking the emerging continuous casting technology that the basis of roll gap technology develops, this technology produces by applying pressure near liquid core of continuous casting billet end the solidification shrinkage amount that certain drafts compensates strand, thus make the solidified structure even compact more of strand, reach the object improved center segregation He alleviate center porosity.The domestic research to dynamic soft reduction technology is at present limited to the evaluation of dynamic soft-reduction sector section equipment development and application effect mostly, is still in the exploratory stage to the research of its technical process mechanism and the exploitation of on-line control system.And the several companies grasping dynamic soft-reduction control technology in the world all hold in close confidence its respective core technology such as control system and technological parameter.Therefore, further investigation slighter compress process control procedure, independent development dynamic soft reduction technology and control system are the desirabilities improving the high-end steel products quality of China, are also to realize China to introduce by relying on a whole set of technical equipment the reality need changed to independent development, design, innovation.
Slighter compress is as the critical process improving Inner Quality of Billet, more and more be subject to the attention of each iron and steel enterprise and more application, current domestic and international each steel mill is for improving Inner Quality of Billet, all carry out the research and practice of slighter compress related process, rational soft reduction process can obtain good mass effect, and it is very important that soft reduction process that is special, coupling formulated by different steel grades; Corresponding internal soundness requires strict steel grade simultaneously, increasing slighter compress amount also becomes the direction that each steel mill gropes, the domestic steel mill's slighter compress amount had has reached 15 ~ 20mm level, and the factory abroad had even carries out rolling at process of setting and depresses and achieve good effect.
In order to produce high-quality Properties of Heavy Rail Steel, domestic and international each steel mill all takes a series of measure in continuous casting equipment and production technology etc., as full guard casting, electromagnetic agitation and soft reduction technique etc.Properties of Heavy Rail Steel continuous casting production technology is greatly improved.Development through the more than ten years and the study to foreign technology and introduction, the standby and technical merit of the integral installation of China's Heavy-rail Production, heavy rail quality in kind have had large increase.The Main Trends of The Development of current rail steel is high strength, high tenacity and high purification.The anti-fatigue performance that rail is good and welding performance are the essential characteristics of rail for high-speed railway.Ensure that rail properties reaches requirement, while strict control is carried out with tissue to the composition of steel, also require that rail steel has good internal soundness.
Summary of the invention
Instant invention overcomes the deficiencies in the prior art, a kind of method improving Properties of Heavy Rail Steel bloom internal soundness is provided, for solving continuous casting billet internal soundness problem, to obtain qualified Properties of Heavy Rail Steel continuous casting billet.
Consider the problems referred to above of prior art, according to an aspect disclosed by the invention, the present invention by the following technical solutions:
Improve a method for Properties of Heavy Rail Steel bloom internal soundness, it comprises;
Continuous casting production cross dimension is the Properties of Heavy Rail Steel bloom of 320mm × 410mm, and casting machine pulling rate is 0.70m/min ~ 0.80m/min, and it is constant to keep pulling rate to stablize, and solidification end slighter compress overall reduction is 22mm; The two chill space electromagnetic stirrings parameter that puts into operation is: 400A, 7Hz; Crystallizer cooling water inflow is set to 3600L/min; The Metal in Tundish degree of superheat is 25 DEG C ~ 30 DEG C; Whole process protection is poured into a mould, and long nozzle and great Bao junction adopt sealing ring+argon gas-sealed.
In order to realize the present invention better, further technical scheme is:
According to one embodiment of the invention, after being poured, carry out spreading out inspection to bloom cc billet surface quality, macroscopic examination has been carried out to internal soundness and follow-up investigations postorder mill bar quality.
Compared with prior art, one of beneficial effect of the present invention is:
A kind of method improving Properties of Heavy Rail Steel bloom internal soundness of the present invention, the cross dimensions of this Properties of Heavy Rail Steel bloom is 320mm × 410mm, be different from the casting machine section of current domestic and international each iron and steel enterprise production Properties of Heavy Rail Steel, the usefulness of the technology of the present invention is, by casting parameters such as Proper Match pulling rate, M-EMS, two chill space electromagnetic stirrings and the controls of solidification end dynamic soft-reduction, in the Properties of Heavy Rail Steel bloom process of producing new section, solve continuous casting billet internal soundness problem, obtain qualified Properties of Heavy Rail Steel continuous casting billet.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
The present invention is mainly by providing a kind of solidification end dynamic soft-reduction control model, this pressure pattern is depressed from the second rhizopodium roller, solid, liquid two-phase district is calculated according to pulling rate and steel grade, pressure range is the region of solid rate 0.2 ~ 0.8, maximum reduction 22mm, the each single roller drafts of reasonable distribution, stablize casting machine pulling rate, the conservative control Metal in Tundish degree of superheat, Aided design crystallizer cooling water inflow, adopt two cold Dynamic controlling, reasonably put into operation the technical measures such as electromagnetic agitation, and the Properties of Heavy Rail Steel continuous casting billet of Fixed Sections is produced in integrated use.Below in conjunction with embodiment, the present invention is further described.
This embodiment uses process control method of the present invention to carry out production Properties of Heavy Rail Steel.Continuous casting production cross dimension is the Properties of Heavy Rail Steel bloom of 320mm × 410mm, casting machine pulling rate is 0.70m/min ~ 0.80m/min, and it is constant to keep pulling rate to stablize, solidification end slighter compress overall reduction is 22mm, and the two chill space electromagnetic stirrings parameter that puts into operation is: 400A, 7Hz.Crystallizer cooling water inflow is set to 3600L/min.The Metal in Tundish degree of superheat is 25 DEG C ~ 30 DEG C.Whole process protection is poured into a mould, and long nozzle is connected employing sealing ring+argon gas-sealed with large bag.
After being poured, carry out spreading out inspection to bloom cc billet surface quality, macroscopic examination is carried out to internal soundness and follow-up investigations postorder mill bar quality, obvious casting billet surface and internal soundness defect is not found in checking process, slab quality is good, and the indexs such as strand center porosity, shrinkage cavity and segregation all meet the demands.
Embodiment 1
This embodiment uses continuous cast method of the present invention to carry out production Properties of Heavy Rail Steel U71Mn.U71Mn trade mark Properties of Heavy Rail Steel chemical constituent is in table 1.Continuous casting production cross dimension is the U71Mn bloom of 320mm × 410mm, and casting machine pulling rate is 0.75m/min, and it is constant to keep pulling rate to stablize, and solidification end slighter compress overall reduction is 22mm, and the two chill space electromagnetic stirrings parameter that puts into operation is: 400A, 7Hz.Crystallizer cooling water inflow is set to 3600L/min.The Metal in Tundish degree of superheat is 25 DEG C, and casting process have employed two cold Dynamic controlling, and two cold specific waters are 0.46kg/t steel.
After being poured, carry out spreading out inspection to Properties of Heavy Rail Steel bloom cc billet surface quality, macroscopic examination is carried out to internal soundness and follow-up investigations postorder mill bar quality, obvious casting billet surface and internal soundness defect is not found in checking process, slab quality is good, and the indexs such as strand center porosity, shrinkage cavity and segregation all meet the demands.
Table 1 U71Mn Properties of Heavy Rail Steel chemical constituent/%
| Composition | C | Si | Mn | P | S | V |
| Content | 0.66-0.76 | 0.30～0.58 | 0.90～1.20 | ≤0.025 | ≤0.025 | ≤0.030 |
Embodiment 2
This embodiment uses continuous cast method of the present invention to carry out production Properties of Heavy Rail Steel U75V.U75V trade mark Properties of Heavy Rail Steel chemical constituent is in table 2.Continuous casting production cross dimension is the U75V bloom of 320mm × 410mm, and casting machine pulling rate is 0.78m/min, and it is constant to keep pulling rate to stablize, and solidification end slighter compress overall reduction is 22mm, and the two chill space electromagnetic stirrings parameter that puts into operation is: 400A, 7Hz.Crystallizer cooling water inflow is set to 3600L/min.The Metal in Tundish degree of superheat is 30 DEG C, and casting process have employed two cold Dynamic controlling, and two cold specific waters are 0.48kg/t steel.
After being poured, carry out spreading out inspection to bloom cc billet surface quality, macroscopic examination is carried out to internal soundness and follow-up investigations postorder mill bar quality, check result shows, casting billet surface and internal soundness good, the indexs such as center porosity, shrinkage cavity and segregation meet the demands, and do not find obvious casting billet surface and internal flaw.The rail quality that correspondence rolls out is good.
Table 2 U75V Properties of Heavy Rail Steel chemical constituent/%
| Composition | C | Si | Mn | P | S | V |
| Content | 0.71-0.80 | 0.50-0.80 | 0.75-1.05 | ≤0.025 | ≤0.025 | 0.04-0.08 |
Embodiment 3
This embodiment uses continuous cast method of the present invention to carry out production Properties of Heavy Rail Steel U78CrV.U78CrV trade mark Properties of Heavy Rail Steel chemical constituent is in table 3.Continuous casting production cross dimension is the U78CrV bloom of 320mm × 410mm, and casting machine pulling rate is 0.75m/min, and it is constant to keep pulling rate to stablize, and solidification end slighter compress overall reduction is 22mm, and the two chill space electromagnetic stirrings parameter that puts into operation is: 400A, 7Hz.Crystallizer cooling water inflow is set to 3600L/min.The Metal in Tundish degree of superheat is 28 DEG C, and casting process have employed two cold Dynamic controlling, and two cold specific waters are 0.46kg/t steel.
After being poured, carry out spreading out inspection to Properties of Heavy Rail Steel bloom cc billet surface quality, macroscopic examination is carried out to internal soundness and follow-up investigations postorder mill bar quality, obvious casting billet surface and internal soundness defect is not found in checking process, slab quality is good, and the indexs such as strand center porosity, shrinkage cavity and segregation all meet the demands.
Table 3 U78CrV Properties of Heavy Rail Steel chemical constituent/%
Every casting parameters of the present invention, can ensure that cast the invention provides the Properties of Heavy Rail Steel production direct motion of section, slab quality is good, can make the appropriate adjustments according to different steel grades in prescribed limit.The Properties of Heavy Rail Steel continuous casting billet quality adopting the present invention to produce is good, without obvious inner and surface quality defect.
In this description, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiment, identical similar portion cross-reference between each embodiment.
Spoken of in this manual " embodiment ", " another embodiment ", " embodiment ", etc., refer to the specific features, structure or the feature that describe in conjunction with this embodiment and be included at least one embodiment of the application's generality description.Multiple place occurs that statement of the same race is not necessarily refer to same embodiment in the description.Furthermore, when describing specific features, structure or a feature in conjunction with any embodiment, what advocate is also fall within the scope of the invention to realize this feature, structure or feature in conjunction with other embodiments.
Although with reference to multiple explanatory embodiment of the present invention, invention has been described here, but, should be appreciated that, those skilled in the art can design a lot of other amendment and embodiment, these amendments and embodiment will drop within spirit disclosed in the present application and spirit.More particularly, in the scope of and claim open in the application, multiple modification and improvement can be carried out to the building block of subject combination layout and/or layout.Except the modification of carrying out building block and/or layout is with except improvement, to those skilled in the art, other purposes also will be obvious.
Claims (3)
1. improve a method for Properties of Heavy Rail Steel bloom internal soundness, it is characterized in that it comprises;
Continuous casting production cross dimension is the Properties of Heavy Rail Steel bloom of 320mm × 410mm, and casting machine pulling rate is 0.70m/min ~ 0.80m/min, and it is constant to keep pulling rate to stablize, and solidification end slighter compress overall reduction is 22mm; The two chill space electromagnetic stirrings parameter that puts into operation is: 400A, 7Hz; Crystallizer cooling water inflow is set to 3600L/min; The Metal in Tundish degree of superheat is 25 DEG C ~ 30 DEG C.
2. a kind of method improving Properties of Heavy Rail Steel bloom internal soundness according to claim 1, it is characterized in that adopting whole process protection cast, long nozzle and great Bao junction adopt sealing ring+argon gas-sealed.
3. a kind of method improving Properties of Heavy Rail Steel bloom internal soundness according to claim 1, after it is characterized in that being poured, carried out spreading out inspection to bloom cc billet surface quality, carried out macroscopic examination and follow-up investigations postorder mill bar quality to internal soundness.
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| CN105108096A (en) * | 2015-10-19 | 2015-12-02 | 首钢总公司 | Method for determining dynamic soft reduction amount during bloom continuous casting of heavy rail steel |
| CN105215310A (en) * | 2015-11-17 | 2016-01-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method that big cross section Properties of Heavy Rail Steel strand center porosity controls |
| CN106475542A (en) * | 2016-11-16 | 2017-03-08 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of axle steel and its continuous cast method |
| CN106513612A (en) * | 2016-11-16 | 2017-03-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail steel continuous casting method |
| CN107008869A (en) * | 2017-05-16 | 2017-08-04 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of heavy rail steel continuous casting billet is produced using continuous cast mold |
| CN107737897A (en) * | 2017-10-27 | 2018-02-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel green shell solidifies control method |
| CN108705052A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | The continuous casting producing method of bloom pinion steel strand |
| CN110216252A (en) * | 2019-07-22 | 2019-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Bloom heavy rail rail head region homogenieity method for improving |
| CN110216253A (en) * | 2019-07-22 | 2019-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Bloom Properties of Heavy Rail Steel disperse is segregated control method |
| CN110216259A (en) * | 2019-07-22 | 2019-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Properties of Heavy Rail Steel homogenieity and web of the rail consistency lifting control method |
| CN110216254A (en) * | 2019-07-22 | 2019-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Properties of Heavy Rail Steel homogenieity improves control method |
| CN110280732A (en) * | 2019-07-22 | 2019-09-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel homogenieity cooperates with lifting control method with compactness |
| CN110280733A (en) * | 2019-07-22 | 2019-09-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section heavy rail rail head region homogenieity lifting control method |
| CN110303124A (en) * | 2019-07-22 | 2019-10-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel casting blank solidification tissue improves control method |
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| CN105108096A (en) * | 2015-10-19 | 2015-12-02 | 首钢总公司 | Method for determining dynamic soft reduction amount during bloom continuous casting of heavy rail steel |
| CN105108096B (en) * | 2015-10-19 | 2018-03-30 | 首钢总公司 | A kind of Properties of Heavy Rail Steel bloom continuous casting dynamic soft-reduction method for determination of amount |
| CN105215310A (en) * | 2015-11-17 | 2016-01-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method that big cross section Properties of Heavy Rail Steel strand center porosity controls |
| CN106475542A (en) * | 2016-11-16 | 2017-03-08 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of axle steel and its continuous cast method |
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| CN107008869A (en) * | 2017-05-16 | 2017-08-04 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of heavy rail steel continuous casting billet is produced using continuous cast mold |
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| CN108705052A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | The continuous casting producing method of bloom pinion steel strand |
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| CN110216259A (en) * | 2019-07-22 | 2019-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Properties of Heavy Rail Steel homogenieity and web of the rail consistency lifting control method |
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| CN110216252A (en) * | 2019-07-22 | 2019-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Bloom heavy rail rail head region homogenieity method for improving |
| CN110280733A (en) * | 2019-07-22 | 2019-09-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section heavy rail rail head region homogenieity lifting control method |
| CN110303124A (en) * | 2019-07-22 | 2019-10-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel casting blank solidification tissue improves control method |
| CN110303131A (en) * | 2019-07-22 | 2019-10-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel disperse is segregated control method |
| CN110303125A (en) * | 2019-07-22 | 2019-10-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Bloom Properties of Heavy Rail Steel homogenieity cooperates with lifting control method with compactness |
| CN110216253A (en) * | 2019-07-22 | 2019-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Bloom Properties of Heavy Rail Steel disperse is segregated control method |
| CN110508763A (en) * | 2019-07-22 | 2019-11-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel microsegregation control method |
| CN110508770A (en) * | 2019-07-22 | 2019-11-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Bloom Properties of Heavy Rail Steel microsegregation control method |
| CN111842826A (en) * | 2020-06-30 | 2020-10-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling quality of casting blank |
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| CN112355264A (en) * | 2020-10-23 | 2021-02-12 | 攀钢集团研究院有限公司 | Method for controlling center porosity of heavy rail steel bloom |
| CN113118400A (en) * | 2021-04-20 | 2021-07-16 | 东北大学 | Homogenized slab continuous casting production method under outfield cooperative control action |
| CN113118400B (en) * | 2021-04-20 | 2022-04-22 | 东北大学 | Homogenized slab continuous casting production method under outfield cooperative control action |
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